Retrievers: Dogs such as the Labrador retriever and the Nova Scotia duck tolling retriever have been bred over hundreds of years to be good gun dogs. This doesn't mean, however, that it is any easier today to get them to work than it was back then.
Command Basics: Whoa, No, Kennel, Sit, and Come are very important basic commands. Before you take your dog out into the field, it should know and obey all of these basic commands. You can't expect your dog to listen and obey when he is running free if he doesn't listen to you when he's on a leash. Teach your dog in the real situation of public fields and not just at home.
Field Training: Once your dog learns those commands and he has been taught not to be frightened by gun noise you can start field training. Start with dummy training. Your dog must learn that he is meant to retrieve something and starting with a dummy is the best way to teach him what he is suppose to do.
Dummy Training Methods: Be sure to choose a dummy that is suitable to your dog. Dummies may be made of plastic or fabric and some are made to look like game birds. You'll know he's ready when your dog has learned to gently retrieve the dummy without shaking or damaging it.
Sometimes switching from the dummy to a real bird confuses or upsets the dog; just switch back to the dummy and add some feathers and streamers similar to the bird you are hunting and work with him for a few more days. A decoy streamer will copy the movement of a bird that is not quite dead, so that your dog will not be scared when he comes across the real thing.
Decoys: Transition to the real bird slowly if your dog shows fear the first time he is asked to retrieve it. You can even get a stuffed duck or pheasant from a taxidermist and use it as a decoy dummy.